Embedding Julia in a Windows application without console

[GunnarFarneback]

If you call jl_init() from a Windows application without a console, Julia 0.7 and 1.0 will abort the application after trying and failing to duplicate an invalid stdio handle. Julia 0.6 was less strict (and possibly less correct) about this but at least the apparent result was that things worked and stdout/stderr output just disappeared.

This doesn't seem like an unreasonable use case for embedding and jl_init should handle it gracefully. If it can't easily be fixed it should at least be documented.

The easiest workaround I have found is to call AllocConsole() before jl_init(), with the predictable drawback that you get a window that you might not want. As a workaround for the workaround you can hide the console window with ShowWindow(GetConsoleWindow(), SW_HIDE), but not without a brief flickering between creation and hiding.

For more details, see https://discourse.julialang.org/t/embedding-jl-init-exits-on-windows-for-julia-0-7/13819

[jaakkor2]

I am seeing on Windows 7 (on a bit different context)
error initializing stdin in uv_dup: Unknown system error 6 (Unknown system error 6 6)
in Julia v1.0.0, whereas Julia v0.6-series worked fine.

If stdin is not available, Julia should not stop.

[jaakkor2]

If I replace this line
https://github.com/JuliaLang/julia/blob/v1.0.0/src/init.c#L375
with ;, the problem is gone for me.

Correctness of this solution is unclear to me.